When trying to use Bumblebee with the video-hybrid-intel-nouveau-bumblebee driver I get the Error message
[ERROR]Cannot access secondary GPU - error: Could not load GPU driver

After installing the video-hybrid-intel-nouveau-bumblebee I could not access the nvidia-settings.
The settings opened but I got an error message that the Nvidia Driver is not in use thus the settings could not be accessed.

When I try to use bumblebee anyways I get the same error that the GPU driver could not be load.
My guess was that the driver wasnt hooked properly in the bumblebee.conf but I there everything seemed to be alright to me.

So my question is how to get the hybrid graphics to work properly with my GTX 970M?

Yes that was also what my internet research told me to do.
After installing the nvidia hybrid driver the system only uses the Intel GPU as it’s supposed to. But when I try to use bumblebee (optirun glxgears) I still get the error:
[ERROR]Cannot access secondary GPU - error: Could not load GPU driver

I’ll try to have a look at the nvidia settings totomorrow.

@Strit
Alright I’ll try the xserver configuration as described in the wiki tomorrow morning

On the Arch wiki Page about bumblebee it says:This could be because the nvidia driver is out of sync with the Linux kernel, for example if you installed the latest nvidia driver and haven't updated the kernel in a while. A full system update might resolve the issue.

So i did an complete System upgrade and after that it actually wokred for the first time.
I tried to test the graphics performance with glmark2.
There the Intel GPU had a score of 560 while the Nvidia only scored 80 ?!

After I rebooted it actually didnt work anymore.
Running optirn glxgears resolved in the error before the upgrade.

No idea why the reboot should have broken it and why the nvidia card (since its a pretty powerful one) scored so low.

After installing the nvidia hybrid driver the system only uses the Intel GPU as it’s supposed to. But when I try to use bumblebee (optirun glxgears) I still get the error:[ERROR]Cannot access secondary GPU - error: Could not load GPU driver